Abstract:In order to test the electrical performance of pulse width modulation(PWM) system amplifier efficiently, a design method of actuator simulator based on phase-shifting pulse counting is proposed. The hardware of the simulator consists of the level conversion unit, the PWM duty cycle set unit, the digital PID control unit and the DAC unit, and the software mainly adopts phase-shifting pulse counting and digital PID control algorithm to realize the replacement of electromechanical performance for real actuators. At the same time, the application of the multi-channel simulator expanded by a single channel can greatly save the placement space of the actuator, shorten the development cycle, and achieve the purpose of mass testing the electrical performance of the PWM amplifier in a short time. The test results show that the actuator simulator can simulate the electrical performance characteristics of the real electric actuators. The system has the advantages of good real-time performance, high test efficiency, good operability and high application value.